1. Field of the Invention
The invention relates to a camshaft adjusting device for internal combustion engines of motor vehicles, comprising an intake camshaft adjuster and/or an exhaust camshaft adjuster drivingly connected to a crankshaft that drives by means of an endless drive the camshaft adjusting device.
2. Description of the Related Art
Camshaft adjusting devices are provided in order to control in internal combustion engines of motor vehicles the opening time of the intake valves as a function of the momentary power demand of the internal combustion engine. For this purpose, an intake camshaft adjuster 1 (
It is an object of the present invention to configure the camshaft adjusting device of the aforementioned kind such that it can be simply mounted even in the case of cramped mounting conditions.
In accordance with the present invention, this is achieved in that the two camshaft adjusters engage one another by means of a gear transmission.
In the camshaft adjusting device of the present invention the two camshaft adjusters are drivingly connected to one another by means of a gear transmission. The drive wheel of the first camshaft adjuster can be mounted easily in a precise position wherein, even in the case of cramped mounting conditions, the endless circulating drive element can be mounted easily.
The two camshaft adjusters each have a stator surrounding a rotor that is rotatable relative to the stator and is fixedly mounted on its camshaft, respectively. The rotors of the camshaft adjusters can be adjusted by pressure medium in the desired direction relative to the stator in order to change in this way the opening time of the intake valves of the internal combustion engine.
In a first embodiment of the invention, the camshaft adjusters directly engage one another by means of their gears. In this case, the crankshaft is connected by means of the endless drive only to the first camshaft adjuster.
In a second configuration, the gears of the two camshaft adjusters engage a common gear wheel which is mounted fixedly on an intermediate shaft. The intermediate shaft is drivingly connected by means of the endless drive to the crankshaft. In this case, the intermediate shaft is rotatably driven by means of the endless drive so that the camshaft adjusters are driven via the gear transmission.
The camshaft adjusting device according to
The gear ring 10 has a greater inner diameter than the peripheral wall 13 of the stator 11. Webs 17 that are uniformly distributed about the circumference project from the inner side of the gear ring 10. The webs 17 connect the gear ring 10 to the stator wall 13. The webs 17 have threaded bores 18 into which the screws 16 can be screwed.
The spacer member 9 has widened portions 19 distributed circumferentially about the member 9 and projecting past both end faces of the spacer member 9. The widened portions 19 each have an opening 20 for passing the screws 16 therethrough.
The chain wheel 6 has an inner circumferentially extending flange 21 that is located at approximately half the width of the chain wheel 6 and is provided with openings 22 distributed about the circumference for passing the screws 16 therethrough. Since the flange 21 is recessed relative to the end faces of the chain wheel 6, the heads 23 of the screws 16 are recessed within the chain wheel 6 (FIG. 4). The spacer member 9 positions the chain wheel 6 at an axial spacing relative to the gear ring 10.
On the end face of the stator wall 13 facing the chain wheel 6 a cover plate 24 (
The chain 5 of the camshaft adjusting device is guided about the chain wheel 6 (FIG. 1). The gear ring 10 engages a gear in the form of a gear ring 28 of the intake camshaft adjuster 1 (
Since the intake camshaft adjuster 1 and the exhaust camshaft adjuster 2 directly engage one another by means of the gear rings 10, 28, the two camshafts 12, 29 can be arranged adjacent to one another at a minimal spacing. In this way, the camshaft adjusting device can be mounted easily even for cramped mounting conditions because the chain drive is provided only between the gear wheel 4 on the crankshaft 3 and the chain wheel 6 of the camshaft adjuster 2.
The chain wheel 6 can be fastened in the described way easily on the stator wall 13. The crankshaft 3 is connected by means of the chain 5 to the camshaft 12 which, in turn, is drivingly connected via the gear rings 10, 28 to the camshaft 29. The gear ring 10 and the chain wheel 6 can be manufactured of different materials so that an optimal material adjustment of these parts is possible with regard to the specific use of the adjusting device.
In the embodiment of
This embodiment is also characterized in that it can be mounted in a simple way even under cramped or tight mounting conditions. The chain drive is provided only between the gear wheel 4 of the crankshaft 3 and the gear wheel 31 of the intermediate shaft 30.
While specific embodiments of the invention have been shown and described in detail to illustrate the inventive principles, it will be understood that the invention may be embodied otherwise without departing from such principles.
Number | Date | Country | Kind |
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103 08 072 | Feb 2003 | DE | national |
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Number | Date | Country | |
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20040221826 A1 | Nov 2004 | US |